HAMMELMANN B7.02502.0210, Operating Instructions Manual

Page: 26 / 311

Operating instructions
Construction & Description
No.: HDP 502 / S 1100-50
Page 20, Issue: 03.2017
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Copyright Hammelmann GmbH
Germany
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D-59302 Oelde
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Carl-Zeiss-Straße 6 - 8
Pos : 31 /Aufbau und Besc hrei bung/Pumpen/H DP 500/Besc hrei bung HDP 502 D oppel keg el ventil @ 9\mod_1349423108726_2.doc x @ 70195 @ 23333 @ 1
7.2 Description
7.2.1 General Description of the High pressure pump
The HDP 502 is a compact, three plunger pump containing the unique HAMMELMANN plunger seal assembly.
The special advantage of this pump is the high pressure plunger seal which reduces friction losses and wear to an
absolute minimum. That guarantees a long working time under highest pressures.
7.2.2 Crank section with pressurised lubrication system
The crank section is precision built to withstand heavy loads. Its function is to transmit the rotary motion of the drive
shaft to an oscillating motion at the pump plungers. The transmission works via three pump plungers turned by
120° with conrods and crossheads. The crankshaft is an assembly made from hardened and tempered steel. The
gearwheels are located on the crankshaft from the inner side near by the outer conrods. The storage of the
crankshaft is carried out by two roller bearings which are located from the outside near the outer conrods. Conrods
have bush bearings both ends running on hardened, polished surfaces at the crankshaft and gudgeon pins.
The pressurised oil lubrication system consists of an oil pump, an oil cooler, an oil filter and an oil pressure
manometer. It supplies all bearing and sliding places with filtered oil. Conrod bearings are lubricated via oil
channels in the crankshaft and the gudgeon pins via channels in the con-rods. The crank mechanism is sealed with
special gaskets and the motor shaft by a rotary shaft seal.
Observe the oil pressure! The ideal oil pressure should be between 4 and 6 bar. A safety
shut off is carried out at 4 bar.
7.2.3 Piston seal assembly
The piston seal assembly is the piston or plunger sealing. The piston or plunger sealing is made by packings. The
arrangement of the packings is so designed that the packings are self adjusted. If there is a higher leakage
observed change the packings. Every leakage goes back into the suction chamber. The piston respectively the
plunger is made by solid ceramics.
7.2.4 Pump head
The high grade stainless steel pump head is not subjected to alternating stress, therefore the risk of fatigue cracking
is eliminated. Pressurised areas have been reduced to an absolute minimum resulting in a correspondingly small
load. The uncomplicated design allows easy access to suction and discharge valves
It operates as follows: